Gao Fei shows his handmade wooden and mechanical book based on the King of the Undersea City in Lanzhou City, the capital of Northwest China’s Gansu Province, Feb. 24, 2017. A teacher at a foreign language school, Gao created a maze and gears with wood and metal, hiding the clues needed to turn a page in the story, provoking reader interest to explore. The book has five pages. (Photo: China News Service/Yang Yanmin)
